'Hello world' Android app

Made by following the instructions at
https://developer.android.com/training/basics/firstapp/creating-project.html

Build & install with:

    ant debug
    adb install bin/MyFirstApp-debug.apk
Remove generated local.properties file

It shouldn't have been checked into version control in the first place
-- it prevents others from building the project since it hard-codes
paths on my PC.
Merge branch 'MyFirstApp'

* MyFirstApp:
  Remove generated local.properties file
  'Hello world' Android app